YSK: Envelopes often have a postal barcode printed on them that contains your address, and you should censor that barcode if you're posting a picture of an envelope.
from /r/YouShouldKnow
YSK：信封上往往印有邮政条码，里面有你的地址，如果你要发一张信封的照片，你应该对这个条码进行审查。
YSK：信封上往往印有邮政条码，里面有你的地址，如果你要发一张信封的照片，你应该对这个条码进行审查。
YSK: Envelopes often have a postal barcode printed on them that contains your address, and you should censor that barcode if you're posting a picture of an envelope.
from /r/YouShouldKnow